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Sounds like a random Windows fart to me. They happen, 99.9% of the time a re-boot and the problems gone. So long as you are sure your hardware is O.K. then just ignore it unless it starts to occur more often.
If it happens more than about once a month it is probably time to back up your files and do a clean re-install of the OS. Over time Windows gets cluttered and messy with drivers, registry changes, etc... and the best way to restore smooth operation is to do a format and clean re-install.
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